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My poor-man’s 10 MHz reference based on the Ublox Neo-7M GPS module didn’t always receive GPS satellites. Since I rely on reception indoors, conditions were sometimes too marginal to lock the oscillator output to 10 MHz. Inspired by the QRPlabs GPS module of Hans Summers (G0UPL) with its large 6 x 6 cm PCB groundplane, I therefore decided to do something similar.

The first picture shows the unit with the 8.5 x 6.5 cm single-sided PCB ground plane attached with double-sided tape. It definitely helped make indoors reception in my shack much more reliable. In addition to the improved conditions for the patch antenna, it probably helps too that the antenna now is shielded from the digital circuitry of the GPS module, the 10 MHz pulse shaper, and the USB interface. I also added a small LED to the right so that I could see from the outside whether the GPS locks properly.

The second picture shows the interior prior to adding the ground plane.

This post is a continuation of these other posts about the 10 MHz reference:

1. Just good enough 10 MHz reference (3 Oct 2015)
2. Better with SMA (15 Oct 2015)
3. Curing amnesia in the 10 MHz GPS reference (19 Nov 2015)

DX-expeditions love their K3s. And I love my K3. But look closely at the MENU button and you will find the marks of someone who literally have put the K3 on their menu as well.

Neither has the BAND button escaped this. Judging from the size of the teeth marks it is perhaps not so hard to guess who did this.

This is our club station’s K3 and off weekends the only inhabitants there are mice, who seem to have taken their fancy on the soft buttons of the K3. They let every other piece of equipment alone, such as the Yaesu FT-1000MP, so there is definitely something special about the K3. I would guess that this was not part of the original Elecraft design specifications for these buttons.
The remedy is shown here: A custom-designed acrylic cover that is fitted on the K3 whenever it is not in use.

This article originally appeared on the LA3ZA Radio & Electronics blog.

DX-expeditions love their K3s. And I love my K3. But look closely at the MENU button and you will find the marks of someone who literally have put the K3 on their menu as well.

Neither has the BAND button escaped this. Judging from the size of the teeth marks it is perhaps not so hard to guess who did this.

This is our club station’s K3 and off weekends the only inhabitants there are mice, who seem to have taken their fancy on the soft buttons of the K3. They let every other piece of equipment alone, such as the Yaesu FT-1000MP, so there is definitely something special about the K3. I would guess that this was not part of the original Elecraft design specifications for these buttons.
The remedy is shown here: A custom-designed acrylic cover that is fitted on the K3 whenever it is not in use.

This article originally appeared on the LA3ZA Radio & Electronics blog.

I have been using small footprint computers in ham shack for a while. It started with the Dell Zino. Always a bit under powered, but enough to get the hamming done. The latest computer driving everything was one of those barebones models that was the size of a shoe box. The first sign of decline was when the fan kept getting louder and LOUDER. The the drive (500GBs of SATA) then decided to give up the ghost.

An immediate lesson learned… back up my log. I have been good at uploading my logs (almost daily, when on the air) to LOTW, QRZ.com, and eQSL. But I would only export that days contacts, consistently replacing the previous days exported log.

I choose not to abandon the small footprint computer and went back to the Shuttle. Newegg.org was my one stop shopping:

The case and motherboard: Shuttle XH81 Intel Core i7 / i5 / i3 / Pentium / Celeron 65W Intel H81 1 x HDMI Barebone system
– small form factor, fits neatly underneath monitor.
– 2x RS-232 connections on the back. Perfect for connecting to the Elecraft amp and tuner.
– Plenty of USB connections

Intel Core i7-4770S Haswell Quad-Core 3.1 GHz LGA 1150 65W BX80646I74770S Desktop Processor Intel HD Graphics
– not the fastest, but fast enough.
– comes with a super quiet fan.

Transcend JetRam 8GB 204-Pin DDR3 SO-DIMM DDR3 1600 (PC3 12800) Laptop Memory Model JM1600KSH-8G
– I got two DIMMs to keep things moving… 16GBs = snappy!

SAMSUNG 850 EVO 2.5″ 250GB SATA III 3-D Vertical Internal Solid State Drive (SSD) MZ-75E250B/AM
– Good bye disk, hello solid state. Faster. Silent.

The actual build was plug and play. The Shuttle line has come a long way since my last experience with their product. I think these specific computers are designed to operate older types of technology (hint…. 2x RS-232 connections?) which works great with most amateur radio needs.

The next step was loading the OS. LiLi USB Creator is my go to solution for installing linux when I don’t have an optical drive (which is more often the case). This allows you to load the OS through booting directly from the USB stick.

The linux flavor of the day: Mint with the MATE edition. I was an Ubuntu man until Unity. Then made the jump to Mint. The OS loaded without issue and I was off and running.

Amazingly enough, I was able to install TQSL-2.2. In the past, I have been able to install TQSL from the Software Manager. But this has been an older version of TQSL. The newer versions ALWAYS gave my problems with dependency issues during attempted installs. I stayed with it this time and finally got it working. Phew!

The install of fldigi went smoothe, but configuring it to work with my Elecraft K3 was giving me fits. In my past setup, I’ve always used hamlib for rig control and the trick was just finding which USB number was being used for my USB Microham III. But this time, the USB Microham III was identified by name as a choice. Great! But it didn’t initialize. I tried USB0 (…. nothing), combed over the results of lsusb…. not… working. After some intense Googling, I ran across a command I had never seen before:

sudo adduser [username] dialout

Dialout!? Who knew? But that did the trick.

Now, here is something funny. We all have our junk boxes. As hams, we are pack rats. We hang on to stuff that has no current use, but may someday. I had a box RS-232 cables. When Fall Cleaning swept through the ham shack, I looked at the RS-232 cables. I am really going to need 15 RS-232 cables ranging in length between two and 15 feet? The box headed to the dump.

Now, with my growing K-Line, I can use Elecraft software (linux versions available) to monitor data from the amp and tuner. But the connections are serial. SERIAL. I turned the ham shack upside down and not an RS-232 cable to be found. I really don’t want to have to actually go out and BUY a serial cable.

Excitement in the shack! We’ve had a new addition. I have had my Elecraft K3 for quite a while. Nothing but positive words about it. It has never let me down.

We’ve all heard about the K-Line. I am assuming that the term K-Line is an omage to the Collins S-Line.

Through my research of MARS, I know that the Collins S-Line was the choice of MARS stations. Collins even had a repair shop located at the major air base outside of Saigon.

Although I have never operated any Collins gear, from what I’ve read it was built like a tank but clearly was designed to have aesthetic appeal. Elecraft is aiming to achieve the same.

I’ve started my attempt at building my K-line with the addition of the Elecraft amp and tuner. Both easily interface with each other and the K3. This allows for seamless band switching and tuning.

While only a 500 watt amplifier, I have already noticed an notable increase in my ability to make contacts and get to the top of the pileup. Band conditions helped, I’m sure – but it was still enjoyable making contacts with South Africa, Findland, the Canary Islands, and Aruba. Stateside contacts have also seemed to be easier to make with a little extra punch.

Just good enough 10 MHz GPS reference with u blox Neo-7M GPS module to the upper right, 10 MHz output buffer lower right, USB interface to the upper left, CR2032 lithium battery center left, GPS antenna in the center, and SMA output connector lower left.

My just good enough 10 MHz GPS reference which drives the external clock input on my Elecraft K3 kept losing its configuration if power was off for a day or so. I have therefore fitted a CR2032 3V lithium battery as seen to the left in this image.

It is connected in series with a 1N4148 diode in order to prevent attempts at charging the lithium cell. The connection goes to pin 22 (V_BCKP) as described by G4ZFQ on his website. The diode is visible to the upper left of the battery.

With this, I consider the 10 MHz reference to be finished.

Earlier related posts:

• Just good enough 10 MHz GPS reference
• Better with SMA

Just good enough 10 MHz GPS reference with u blox Neo-7M GPS module to the upper right, 10 MHz output buffer lower right, USB interface to the upper left, CR2032 lithium battery center left, GPS antenna in the center, and SMA output connector lower left.

My “just good enough 10 MHz GPS reference” which drives the external clock input on my Elecraft K3 kept losing its configuration if power was off for a day or so. I have therefore fitted a CR2032 3V lithium battery as seen to the left in this image.

It is connected in series with a 1N4148 diode in order to prevent attempts at charging the lithium cell. The connection goes to pin 22 (V_BCKP) as described by G4ZFQ on his website. The diode is visible to the upper left of the battery.

With this, I consider the 10 MHz reference to be finished.

Other related posts:

• Just good enough 10 MHz GPS reference
• Better with SMA
• Improved GPS reception with a ground plane